PHITransAddr - An address value which tracks and handles phi translation. More...

#include "llvm/Analysis/PHITransAddr.h"

Public Member Functions
	PHITransAddr (Value addr, const DataLayout &DL, AssumptionCache AC)

Value *	getAddr () const

bool	NeedsPHITranslationFromBlock (BasicBlock *BB) const
	NeedsPHITranslationFromBlock - Return true if moving from the specified BasicBlock to its predecessors requires PHI translation. More...

bool	IsPotentiallyPHITranslatable () const
	IsPotentiallyPHITranslatable - If this needs PHI translation, return true if we have some hope of doing it. More...

bool	PHITranslateValue (BasicBlock CurBB, BasicBlock PredBB, const DominatorTree *DT, bool MustDominate)
	PHITranslateValue - PHI translate the current address up the CFG from CurBB to Pred, updating our state to reflect any needed changes. More...

Value *	PHITranslateWithInsertion (BasicBlock CurBB, BasicBlock PredBB, const DominatorTree &DT, SmallVectorImpl< Instruction * > &NewInsts)
	PHITranslateWithInsertion - PHI translate this value into the specified predecessor block, inserting a computation of the value if it is unavailable. More...

void	dump () const

bool	Verify () const
	Verify - Check internal consistency of this data structure. More...

Detailed Description

PHITransAddr - An address value which tracks and handles phi translation.

As we walk "up" the CFG through predecessors, we need to ensure that the address we're tracking is kept up to date. For example, if we're analyzing an address of "&A[i]" and walk through the definition of 'i' which is a PHI node, we must phi translate i to get "&A[j]" or else we will analyze an incorrect pointer in the predecessor block.

This is designed to be a relatively small object that lives on the stack and is copyable.

Definition at line 35 of file PHITransAddr.h.

Constructor & Destructor Documentation

◆ PHITransAddr()

llvm::PHITransAddr::PHITransAddr	(	Value *	addr,
		const DataLayout &	DL,
		AssumptionCache *	AC
	)

inline

Definition at line 52 of file PHITransAddr.h.

References Addr, DL, and I.

Member Function Documentation

◆ dump()

LLVM_DUMP_METHOD void PHITransAddr::dump ( ) const

Definition at line 45 of file PHITransAddr.cpp.

References llvm::dbgs(), llvm::numbers::e, and i.

◆ getAddr()

Value* llvm::PHITransAddr::getAddr ( ) const

inline

Definition at line 59 of file PHITransAddr.h.

References Addr.

Referenced by memoryIsNotModifiedBetween().

◆ IsPotentiallyPHITranslatable()

bool PHITransAddr::IsPotentiallyPHITranslatable ( ) const

IsPotentiallyPHITranslatable - If this needs PHI translation, return true if we have some hope of doing it.

This should be used as a filter to avoid calling PHITranslateValue in hopeless situations.

Definition at line 114 of file PHITransAddr.cpp.

References CanPHITrans().

Referenced by memoryIsNotModifiedBetween().

◆ NeedsPHITranslationFromBlock()

bool llvm::PHITransAddr::NeedsPHITranslationFromBlock ( BasicBlock * BB ) const

inline

NeedsPHITranslationFromBlock - Return true if moving from the specified BasicBlock to its predecessors requires PHI translation.

Definition at line 63 of file PHITransAddr.h.

References BB, llvm::numbers::e, getParent(), and i.

Referenced by memoryIsNotModifiedBetween().

◆ PHITranslateValue()

bool PHITransAddr::PHITranslateValue	(	BasicBlock *	CurBB,
		BasicBlock *	PredBB,
		const DominatorTree *	DT,
		bool	MustDominate
	)

PHITranslateValue - PHI translate the current address up the CFG from CurBB to Pred, updating our state to reflect any needed changes.

If 'MustDominate' is true, the translated value must dominate PredBB. This returns true on failure and sets Addr to null.

Definition at line 314 of file PHITransAddr.cpp.

References assert(), llvm::DominatorTree::dominates(), llvm::Instruction::getParent(), llvm::DominatorTree::isReachableFromEntry(), and Verify().

Referenced by memoryIsNotModifiedBetween().

◆ PHITranslateWithInsertion()

Value * PHITransAddr::PHITranslateWithInsertion	(	BasicBlock *	CurBB,
		BasicBlock *	PredBB,
		const DominatorTree &	DT,
		SmallVectorImpl< Instruction * > &	NewInsts
	)